If you sign up with the PDGA, you'll have a rating. Play where you're eligible, if that's what you want to do.
If you're not a PDGA member, or are playing in a non-PDGA event, you're subject to the decision of the TD. Live with it.
Do you have other, poor-performance events to offset that runaway? If not, if that's the only tournament you've played, you should be MA2, and probably MA1.
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